Uniting or welding metal



Nrrnn \VILLIAM GRIFFITH, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, OF ONE-HALF TO JAMES ANDREWVS, OF ALLEGHENY, PENNSYLVANIA.

UNITING OR WELDING METAL.

SPECIFICATION forming part Of Letters Patent No. 580,344, dated April 6,1897. Application filed January 21, 1897. Serial No. 620,140. (Nospecimens.)

T ail whom it n'my concern: sheets or plates of metal, it beingunderstood Be it known that I, WILLIAM GRIFFITH, a that only mechanicalskill is required in citizen of the United States, residing at Pittsadapting the process to other forms or shapes, burg, in the county ofAllegheny and State of and although either iron or steel may be weld- 55 Pennsylvania-,have invented certain new and ed or plated with copperor an alloy thereof useful Improvements in Uniting or Veldiug or anyother metal or alloy of the same I use Metals; and I do hereby declarethe following the word steel, the process being the same to be a full,clear, and exact description of the with either of the two metals.invention, such as will enable others skilled The plate of steel isfirst carefully cleansed 6o 10 in the art to which it appertains to makeand from oxid or scale in any preferred manner,

use the same. in this instance by the use of a bath of sul- Thisinvention relates to uniting or welding furic acid in the usual mannerof removing metals. such oXid, and it is then ready to receive a Theobject is to unite copper or alloys therecoating or surface of copper oran alloy thereof 65 of with other metals so as to produce metal or ofany other suitable metal or alloy thereof plates and other articles ofmetal having one capable of being deposited by chemical or elecor bothfaces of copper or of copper alloyed trical deposition or otherwise. Inthis inwith other metals. stance the plate of steel is placed in a bathof I'Ieretofore while it has been possible to coat a solution of one ofthe salts of copper. This 70 or plate iron and steel plates with copperthe bath may be formed by dissolving sulfate of two metals have not beenpractically and succopper in weak sulfuric acid ;-but I donotdecessfully united by welding. sire to limit myself to the sulfate ofcopper or The purpose of this invention is to weld toto the sulfuricacid, as any equivalent salt or gether plates, sheets, bars, or otherforms of acid may be substituted therefor. The plate 75 steel or ironand copper or alloys thereof in is allowed to remain in this bath untilits sursuch manner as to effect a perfect and intiface or surfaces willbe covered with a deposit mate union between the two metals. of copperor an alloy thereof, which is gen- To this end the invention consists inthe erally accomplished in from one-half an hour process hereinafterdescribed, in which the to an hour. The plate is then removed from 80plate, bar, or other article of iron or steel is the bath and a sheet ofcopper or an alloy first cleansed from scale or oXid;- its surfacethereof or of any other suitable metal or an or surfaces then coveredwith a coating or dealloy thereof of any desired thicknessis placedposit of copper or an alloy of copper or any on a face thereof and issecured thereon in other suitable metal or alloy thereof capable anyconvenient manner, as by bending the 85 3 5 of being deposited bychemical or electrical edges of the copper or the like over the edgesdeposition or otherwise, in this instance by the of the plate, or inorder to save waste tangs action of a bath of a solution of the salts ofmay be provided at the corners or at suitable copper; is then placedface to face with a sheet intervals and be bent to embrace the plate. orplate of copper or an alloy thereof or any There the plate is to haveboth faces of cop- 90 40 other suitable metal or an alloy thereof; isper or the like, two plates of the same are sethen heated to the properdegree, and, finally, cured to the steel plate, one on each side or ispassed through rolls or is subjected to presface thereof. The plate ofsteel, with the copsure requisite to effect the perfect and intiperplate or plates or alloys thereof, is then mate welding of the metals.placed in a suitable furnace and subjected to 5 I will now describe theinvention, so that a heat of about 1,7 00", more or less, Fahrenothersskilled in the art to which it appertains heit. After the plates areproperly heated may employ the same. they are removed and passed throughrolls or The invention may be applied to various other pressure-exertingmechanism, thereby forms or shapes of metal, such as plates, bars,effecting the perfect welding together of the I00 rods, 850.; but forthe sake of brevity I will plates.

confine this description to the welding of As above stated, I may,instead of using pure copper, employ alloys of the same, such as Muntzsmetal, or brass may be employed in a like manner as the copper,excepting with some alloys a greater or less heat may be required priorto Welding, as will be apparent to those skilled in the art.

It is to be understood that this invention is not to be limited to themere facing of a sheet or plate of iron orsteel with copperor the like,as I may Weld together two or more sheets or plates of the same ordifferent metals and of the same or different hardness to build uparmor-plate, or for sheathing for vessels I may employ iron or steelfaced With yellow or ships metal.

Having thus fully described my invention, What I claim as new, anddesire to secure by Letters Patent, is

The herein-described process of uniting or welding plates of metal ofdifferent kinds, which consists in cleansing one of the plates fromscale, oxid, or other impurities, then coating or covering one or morefaces of this plate with a metal or an alloy thereof having a lowerfusing-point, then applying to this coated surface a plate of metal oran alloy of the same character as the coating, but free from anycoating, then applying heat to the two plates, and finally uniting bypressure, substantially as described.

In testimony whereof I have hereunto set my hand.

IVILLIAM GRIFFITH.

WVitnesses:

JAMES K. BAKEWELL, WILLIAM J oHNs.

